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Infection and colonization of melon roots by Monosporascus cannonballus in two cropping seasons in Arizona and California
Author(s) -
Stanghellini M. E.,
Kim D. H.,
Waugh M. M.,
Ferrin D. M.,
Alcantara T.,
Rasmussen S. L.
Publication year - 2004
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.2004.00943.x
Subject(s) - biology , sowing , vine , agronomy , growing season , horticulture , melon , colonization , ecology
Although canopy collapse of melons (one of the above‐ground symptoms of vine decline caused by Monosporascus cannonballus ) occurred late in the growing season, the onset of root infection occurred much earlier. In three early winter‐spring and two late winter‐spring crops, the onset of root infection occurred 47–65 and 35–36 days after planting, respectively. In contrast, in four summer‐autumn crops, the onset of root infection occurred within 9–17 days after planting. Vine decline occurred commonly in winter‐spring crops, but did not occur in any of the summer‐autumn crops. Following the onset of root infection, the percentage of plants infected increased at rates of 0·031–0·036 and 0·038–0·070 per unit per day for winter‐spring and summer‐autumn crops, respectively, based on the monomolecular disease progress model. Root lesions were first observed 14–42 days after the onset of infection in winter‐spring crops, and 14–28 days after the onset of infection in summer‐autumn crops. Pathogen reproduction occurred primarily at the end of each growing season.